<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo</title>
</head>
<body>
<script>
    /**
     *
     * @param obj
     * @returns {boolean}
     */
    function isEmpty(obj) {
        if (obj) {
            return true;
        }
        // if (obj && typeof obj === "string") {
        //     return true;
        // }
        // if (obj && typeof obj === "number") {
        //     return true;
        // }
        return false;
    }

    console.log(isEmpty());
    console.log(isEmpty(null));
    console.log(isEmpty(""));
    console.log(isEmpty(undefined));
    console.log(isEmpty("hello"));
    console.log(isEmpty(10));
    console.log(isEmpty(true));
    console.log(isEmpty(false));
</script>
</body>
</html>
